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From incommensurate correlations to mesoscopic spin resonance in YbRh2Si2

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arxiv 1207.4411 v1 pith:WYMUAPAV submitted 2012-07-18 cond-mat.str-el cond-mat.mtrl-sci

From incommensurate correlations to mesoscopic spin resonance in YbRh2Si2

C. Stock , C. Broholm , F. Demmel , J. Van Duijn , J. W. Taylor , H.J. Kang , R. Hu , C. Petrovic This is my paper
classification cond-mat.str-el cond-mat.mtrl-sci
keywords deltaspincorrelationsfieldfluctuationsincommensuratemagneticybrh2si2
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Spin fluctuations are reported near the magnetic field driven quantum critical point in YbRh2Si2. On cooling, ferromagnetic fluctuations evolve into incommensurate correlations located at q0=+/- (delta,delta) with delta=0.14 +/- 0.04 r.l.u. At low temperatures, an in plane magnetic field induces a sharp intra doublet resonant excitation at an energy E0=g muB mu0 H with g=3.8 +/- 0.2. The intensity is localized at the zone center indicating precession of spin density extending xi=6 +/- 2 A beyond the 4f site.

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